Versioning them has its plusses and minuses. Personally, I like `omeroweb.viewer.min.css` but I can see why having a versioned file would be useful. The only problem I can see with this is that `omero_version` can be really troublesome. You have the possibility of having something like `omeroweb-v.5.1.0-m0-411-gfdb71c3.min.css`. Not particularly useful.